INHERITANCE OF CLUBROOT RESISTANCE IN CABBAGE (BRASSICA OLERACEA L. VAR. CAPITATA L.)

Abstract

T w o clubroot-susceptible cabbage cultivars, Red Acre and Golden Acre, were crossed with the resistant line, 8-41. I;, data showed that susceptibility was dominant over resistance and data from I;? and backcross progenies supported a duplicate gene I~ypothcsis. Genes Pb, and Pb, were proposed t o designate susceptible loci. All genotypes of these n v o genes were susceptible cxccpt the homozygous recessive pb,, pb,, pb,, ph, which was resistant.

Free amino acid content in leaf and root tissues of clubroot-resistant and clubroot-susceptible cabbages

“…The clubroot-resistant line 8-41 (CHIANG & CRETE, 1970) and the susceptible cultivar Penn State Ballhead (PSB) were grown in well-decomposed and uninfested organic soil at Ste . Clotilde, Quebec, in 1969 .…”

“…brassicae but susceptible to race 2 (SEAMAN et al ., 1963 ;CHIANG & CRETE, 1970), a study of the change in free AA's in clubroot-infected plants of both susceptible and resistant cultivars might further clarify their relationship .…”

Cauliflower and Broccoli

“…Several studies have been carried out, such as for clubroot (Plasmodiophora brassicae) for which sources of resistance were found to be under the control of an incomplete dominant and a recessive gene, pb1 pb1, pb2 pb2 (Vriesenga and Honma, 1971;Chiang and Crete, 1970).…”

Association of RFLP markers with trait loci affecting clubroot resistance and morphological characters in Brassica oleracea L.

“…capitata) was polygenic and recessive . Other studies have suggested that a pair of genes determines most of the resistance to clubroot in some B. oleracea cultivars (Chiang & Crete, 1970 ;Vriesenga & Honma, 1971) . Chiang & Crete (1976) concluded that additive effects were more important than dominance in cabbage .…”